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Date: Thu, 5 Dec 2013 08:09:17 -0600
From: Rob Herring <robherring2@...il.com>
To: Hanjun Guo <hanjun.guo@...aro.org>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Russell King - ARM Linux <linux@....linux.org.uk>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Mark Rutland <mark.rutland@....com>,
Matthew Garrett <mjg59@...f.ucam.org>,
"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
Graeme Gregory <graeme.gregory@...aro.org>,
Al Stone <al.stone@...aro.org>,
Linaro Patches <patches@...aro.org>,
Olof Johansson <olof@...om.net>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Rob Herring <rob.herring@...xeda.com>,
linaro-acpi@...ts.linaro.org, linux-acpi@...r.kernel.org,
Grant Likely <grant.likely@...aro.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC part1 PATCH 5/7] ARM64 / ACPI: Introduce arm_core.c and its
related head file
On Tue, Dec 3, 2013 at 10:36 AM, Hanjun Guo <hanjun.guo@...aro.org> wrote:
> introduce arm_core.c and its related head file, after this patch,
> we can get ACPI tables from BIOS on ARM64 now.
>
> Signed-off-by: Al Stone <al.stone@...aro.org>
> Signed-off-by: Graeme Gregory <graeme.gregory@...aro.org>
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> ---
> arch/arm64/include/asm/acpi.h | 57 +++++++++++
> arch/arm64/kernel/setup.c | 8 ++
> drivers/acpi/Makefile | 2 +
> drivers/acpi/plat/Makefile | 1 +
> drivers/acpi/plat/arm-core.c | 219 +++++++++++++++++++++++++++++++++++++++++
> 5 files changed, 287 insertions(+)
> create mode 100644 drivers/acpi/plat/Makefile
> create mode 100644 drivers/acpi/plat/arm-core.c
>
> diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
> index c186f5b..e9444e4 100644
> --- a/arch/arm64/include/asm/acpi.h
> +++ b/arch/arm64/include/asm/acpi.h
> @@ -19,6 +19,43 @@
> #ifndef _ASM_ARM_ACPI_H
> #define _ASM_ARM_ACPI_H
>
> +#include <asm/cacheflush.h>
> +
> +#include <linux/init.h>
> +
> +#define COMPILER_DEPENDENT_INT64 long long
> +#define COMPILER_DEPENDENT_UINT64 unsigned long long
> +
> +/*
> + * Calling conventions:
> + *
> + * ACPI_SYSTEM_XFACE - Interfaces to host OS (handlers, threads)
> + * ACPI_EXTERNAL_XFACE - External ACPI interfaces
> + * ACPI_INTERNAL_XFACE - Internal ACPI interfaces
> + * ACPI_INTERNAL_VAR_XFACE - Internal variable-parameter list interfaces
> + */
> +#define ACPI_SYSTEM_XFACE
> +#define ACPI_EXTERNAL_XFACE
> +#define ACPI_INTERNAL_XFACE
> +#define ACPI_INTERNAL_VAR_XFACE
> +
> +/* Asm macros */
> +#define ACPI_FLUSH_CPU_CACHE() flush_cache_all()
> +
> +/* Basic configuration for ACPI */
> +#ifdef CONFIG_ACPI
> +extern int acpi_disabled;
> +extern int acpi_noirq;
> +extern int acpi_pci_disabled;
> +extern int acpi_strict;
> +
> +static inline void disable_acpi(void)
> +{
> + acpi_disabled = 1;
> + acpi_pci_disabled = 1;
> + acpi_noirq = 1;
> +}
> +
> static inline bool arch_has_acpi_pdc(void)
> {
> return false; /* always false for now */
> @@ -29,4 +66,24 @@ static inline void arch_acpi_set_pdc_bits(u32 *buf)
> return;
> }
>
> +static inline void acpi_noirq_set(void) { acpi_noirq = 1; }
> +static inline void acpi_disable_pci(void)
> +{
> + acpi_pci_disabled = 1;
> + acpi_noirq_set();
> +}
> +
> +/* FIXME: this function should be moved to topology.h when it's ready */
> +void arch_fix_phys_package_id(int num, u32 slot);
> +
> +/* temperally define -1 to make acpi core compilerable */
> +#define cpu_physical_id(cpu) -1
> +
> +#else /* !CONFIG_ACPI */
> +#define acpi_disabled 1 /* ACPI sometimes enabled on ARM */
> +#define acpi_noirq 1 /* ACPI sometimes enabled on ARM */
> +#define acpi_pci_disabled 1 /* ACPI PCI sometimes enabled on ARM */
> +#define acpi_strict 1 /* no ACPI spec workarounds on ARM */
> +#endif
> +
> #endif /*_ASM_ARM_ACPI_H*/
> diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
> index bd9bbd0..8199360 100644
> --- a/arch/arm64/kernel/setup.c
> +++ b/arch/arm64/kernel/setup.c
> @@ -41,6 +41,7 @@
> #include <linux/memblock.h>
> #include <linux/of_fdt.h>
> #include <linux/of_platform.h>
> +#include <linux/acpi.h>
>
> #include <asm/cputype.h>
> #include <asm/elf.h>
> @@ -225,6 +226,13 @@ void __init setup_arch(char **cmdline_p)
>
> arm64_memblock_init();
>
> + /*
> + * Parse the ACPI tables for possible boot-time configuration
> + */
> + acpi_boot_table_init();
> + early_acpi_boot_init();
> + acpi_boot_init();
> +
How about a single function here. Perhaps called acpi_early_init. That
would save checking acpi_disabled 3 times.
> paging_init();
> request_standard_resources();
>
> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
> index d8cebe3..9fbba50 100644
> --- a/drivers/acpi/Makefile
> +++ b/drivers/acpi/Makefile
> @@ -83,3 +83,5 @@ obj-$(CONFIG_ACPI_PROCESSOR_AGGREGATOR) += acpi_pad.o
> obj-$(CONFIG_ACPI_APEI) += apei/
>
> obj-$(CONFIG_ACPI_EXTLOG) += acpi_extlog.o
> +
> +obj-y += plat/
> diff --git a/drivers/acpi/plat/Makefile b/drivers/acpi/plat/Makefile
> new file mode 100644
> index 0000000..46bc65e
> --- /dev/null
> +++ b/drivers/acpi/plat/Makefile
> @@ -0,0 +1 @@
> +obj-$(CONFIG_ARM64) += arm-core.o
> diff --git a/drivers/acpi/plat/arm-core.c b/drivers/acpi/plat/arm-core.c
> new file mode 100644
> index 0000000..7b8e64a
> --- /dev/null
> +++ b/drivers/acpi/plat/arm-core.c
> @@ -0,0 +1,219 @@
> +/*
> + * ARM/ARM64 Specific Low-Level ACPI Boot Support
> + *
> + * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@...el.com>
> + * Copyright (C) 2001 Jun Nakajima <jun.nakajima@...el.com>
> + * Copyright (C) 2013, Al Stone <al.stone@...aro.org> (ARM version)
> + *
> + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> + */
> +
> +#include <linux/init.h>
> +#include <linux/acpi.h>
> +#include <linux/acpi_pmtmr.h>
> +#include <linux/efi.h>
> +#include <linux/cpumask.h>
> +#include <linux/memblock.h>
> +#include <linux/module.h>
> +#include <linux/irq.h>
> +#include <linux/irqdomain.h>
> +#include <linux/slab.h>
> +#include <linux/bootmem.h>
> +#include <linux/ioport.h>
> +#include <linux/pci.h>
> +
> +#include <asm/pgtable.h>
> +#include <asm/io.h>
linux/io.h although I can't see where it is even needed.
> +#include <asm/smp.h>
linux/smp.h ...
Seems like you have a lot of unnecessary headers here. efi.h, slab.h,
pci.h, etc.
> +
> +/*
> + * We never plan to use RSDT on arm/arm64 as its deprecated in spec but this
> + * variable is still required by the ACPI core
> + */
> +u32 acpi_rsdt_forced;
> +
> +int acpi_noirq; /* skip ACPI IRQ initialization */
> +int acpi_strict;
> +int acpi_disabled;
> +EXPORT_SYMBOL(acpi_disabled);
> +
> +int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */
> +EXPORT_SYMBOL(acpi_pci_disabled);
> +
> +#define PREFIX "ACPI: "
> +
> +/* FIXME: this function should be moved to topology.c when it is ready */
> +void arch_fix_phys_package_id(int num, u32 slot)
> +{
> + return;
> +}
> +EXPORT_SYMBOL_GPL(arch_fix_phys_package_id);
> +
> +/*
> + * Boot-time Configuration
> + */
> +
It is not really clear what this comment applies to.
> +enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;
> +
> +static unsigned int gsi_to_irq(unsigned int gsi)
> +{
> + int irq = irq_create_mapping(NULL, gsi);
> +
> + return irq;
> +}
> +
> +/*
> + * __acpi_map_table() will be called before page_init(), so early_ioremap()
> + * or early_memremap() should be called here.
> + *
> + * FIXME: early_io/memremap()/early_iounmap() are not upstream yet on ARM64,
> + * just wait for Mark Salter's patchset accepted by mainline
> + */
> +char *__init __acpi_map_table(unsigned long phys, unsigned long size)
> +{
> + if (!phys || !size)
> + return NULL;
> +
> + /*
> + * temporarily use phys_to_virt(),
> + * should be early_memremap(phys, size) here
> + */
> + return phys_to_virt(phys);
> +}
> +
> +void __init __acpi_unmap_table(char *map, unsigned long size)
> +{
> + if (!map || !size)
> + return;
> +
> + /* should be early_iounmap(map, size); */
> + return;
> +}
> +
> +int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
> +{
> + *irq = gsi_to_irq(gsi);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
> +
> +/*
> + * success: return IRQ number (>=0)
'> 0' for interrupts is what normally means success in the kernel. 0
is for no irq.
> + * failure: return < 0
> + */
> +int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
> +{
> + return -1;
> +}
> +EXPORT_SYMBOL_GPL(acpi_register_gsi);
> +
> +void acpi_unregister_gsi(u32 gsi)
> +{
> +}
> +EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
> +
> +static int __init acpi_parse_fadt(struct acpi_table_header *table)
> +{
> + return 0;
> +}
> +
> +static void __init early_acpi_process_madt(void)
> +{
> + return;
> +}
> +
> +static void __init acpi_process_madt(void)
> +{
> + return;
> +}
> +
> +/*
> + * acpi_boot_table_init() and acpi_boot_init()
> + * called from setup_arch(), always.
> + * 1. checksums all tables
> + * 2. enumerates lapics
> + * 3. enumerates io-apics
> + *
> + * acpi_table_init() is separated to allow reading SRAT without
> + * other side effects.
> + */
> +void __init acpi_boot_table_init(void)
> +{
> + /*
> + * If acpi_disabled, bail out
> + */
> + if (acpi_disabled)
> + return;
> +
> + /*
> + * Initialize the ACPI boot-time table parser.
> + */
> + if (acpi_table_init()) {
> + disable_acpi();
> + return;
> + }
> +}
> +
> +int __init early_acpi_boot_init(void)
> +{
> + /*
> + * If acpi_disabled, bail out
> + */
> + if (acpi_disabled)
> + return 1;
> +
> + /*
> + * Process the Multiple APIC Description Table (MADT), if present
> + */
> + early_acpi_process_madt();
> +
> + return 0;
> +}
> +
> +int __init acpi_boot_init(void)
> +{
> + /*
> + * If acpi_disabled, bail out
> + */
> + if (acpi_disabled)
> + return 1;
> +
> + acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt);
> +
> + /*
> + * Process the Multiple APIC Description Table (MADT), if present
> + */
> + acpi_process_madt();
> +
> + return 0;
> +}
> +
> +static int __init parse_acpi(char *arg)
> +{
> + if (!arg)
> + return -EINVAL;
> +
> + /* "acpi=off" disables both ACPI table parsing and interpreter */
> + if (strcmp(arg, "off") == 0) {
> + disable_acpi();
> + }
> + /* acpi=strict disables out-of-spec workarounds */
> + else if (strcmp(arg, "strict") == 0) {
> + acpi_strict = 1;
> + }
> + return 0;
> +}
> +early_param("acpi", parse_acpi);
These aren't common options across architectures?
Rob
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